How do I configure Vert.x event bus to work across cluster of Docker containers?

Question

In my current setup, I\'m using the default multicast option of the Hazelcast cluster manager. When I link the instances of my containerized Vertx modules (via Docker networ

Answer 1

The cluster manager works fine, the cluster manager configuration has to be the same on each node (machine/docker container) in your cluster or don't make any configurations at all (use the default configuration of your cluster manager).

You have to make the event bus configuration be consistent on each node, you have to set the cluster host on each node to be the IP address of this node itself and any arbitrary port number (unless you try to run more than Vert.x instance on the same node you have to choose a different port number for each Vert.x instance).

For example if a node's IP address is 192.168.1.12 then you would do the following:

VertxOptions options = new VertxOptions()
                .setClustered(true)
                .setClusterHost("192.168.1.12") // node ip
                .setClusterPort(17001) // any arbitrary port but make sure no other Vert.x instances using same port on the same node
                .setClusterManager(clusterManager);

on another node whose IP address is 192.168.1.56 then you would do the following:

VertxOptions options = new VertxOptions()
                .setClustered(true)
                .setClusterHost("192.168.1.56") // other node ip
                .setClusterPort(17001) // it is ok because this is a different node
                .setClusterManager(clusterManager);